Partial revert of 1f8913a9

For WebFlux we can't use ServletContextAware.

See gh-30344

spring-webflux/src/main/java/org/springframework/web/reactive/socket/server/support/HandshakeWebSocketService.java

@@ -25,7 +25,6 @@ import java.util.Map;
 import java.util.function.Predicate;
 import java.util.stream.Collectors;
 
-import jakarta.servlet.ServletContext;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import reactor.core.publisher.Mono;
@@ -40,7 +39,6 @@ import org.springframework.util.Assert;
 import org.springframework.util.ClassUtils;
 import org.springframework.util.MultiValueMap;
 import org.springframework.util.StringUtils;
-import org.springframework.web.context.ServletContextAware;
 import org.springframework.web.reactive.socket.HandshakeInfo;
 import org.springframework.web.reactive.socket.WebSocketHandler;
 import org.springframework.web.reactive.socket.server.RequestUpgradeStrategy;
@@ -65,7 +63,7 @@ import org.springframework.web.server.ServerWebInputException;
  * @author Juergen Hoeller
  * @since 5.0
  */
-public class HandshakeWebSocketService implements WebSocketService, ServletContextAware, Lifecycle {
+public class HandshakeWebSocketService implements WebSocketService, Lifecycle {
 
 	private static final String SEC_WEBSOCKET_KEY = "Sec-WebSocket-Key";
 
@@ -157,13 +155,6 @@ public class HandshakeWebSocketService implements WebSocketService, ServletConte
 		return this.sessionAttributePredicate;
 	}
 
-	@Override
-	public void setServletContext(ServletContext servletContext) {
-		if (getUpgradeStrategy() instanceof ServletContextAware servletContextAware) {
-			servletContextAware.setServletContext(servletContext);
-		}
-	}
-
 
 	@Override
 	public void start() {

spring-webflux/src/main/java/org/springframework/web/reactive/socket/server/support/WebSocketHandlerAdapter.java

@@ -16,13 +16,11 @@
 
 package org.springframework.web.reactive.socket.server.support;
 
-import jakarta.servlet.ServletContext;
 import reactor.core.publisher.Mono;
 
 import org.springframework.context.annotation.ImportRuntimeHints;
 import org.springframework.core.Ordered;
 import org.springframework.util.Assert;
-import org.springframework.web.context.ServletContextAware;
 import org.springframework.web.reactive.HandlerAdapter;
 import org.springframework.web.reactive.HandlerResult;
 import org.springframework.web.reactive.socket.WebSocketHandler;
@@ -49,7 +47,7 @@ import org.springframework.web.server.ServerWebExchange;
  * @since 5.0
  */
 @ImportRuntimeHints(HandshakeWebSocketServiceRuntimeHints.class)
-public class WebSocketHandlerAdapter implements HandlerAdapter, ServletContextAware, Ordered {
+public class WebSocketHandlerAdapter implements HandlerAdapter, Ordered {
 
 	private final WebSocketService webSocketService;
 
@@ -99,13 +97,6 @@ public class WebSocketHandlerAdapter implements HandlerAdapter, ServletContextAw
 		return this.webSocketService;
 	}
 
-	@Override
-	public void setServletContext(ServletContext servletContext) {
-		if (this.webSocketService instanceof ServletContextAware servletContextAware) {
-			servletContextAware.setServletContext(servletContext);
-		}
-	}
-
 
 	@Override
 	public boolean supports(Object handler) {

spring-webflux/src/main/java/org/springframework/web/reactive/socket/server/upgrade/JettyRequestUpgradeStrategy.java

@@ -16,7 +16,6 @@
 
 package org.springframework.web.reactive.socket.server.upgrade;
 
-import java.util.function.Consumer;
 import java.util.function.Supplier;
 
 import jakarta.servlet.ServletContext;
@@ -24,7 +23,6 @@ import jakarta.servlet.http.HttpServletRequest;
 import jakarta.servlet.http.HttpServletResponse;
 import org.eclipse.jetty.ee10.websocket.server.JettyWebSocketCreator;
 import org.eclipse.jetty.ee10.websocket.server.JettyWebSocketServerContainer;
-import org.eclipse.jetty.websocket.api.Configurable;
 import reactor.core.publisher.Mono;
 
 import org.springframework.core.io.buffer.DataBufferFactory;
@@ -33,7 +31,6 @@ import org.springframework.http.server.reactive.ServerHttpRequestDecorator;
 import org.springframework.http.server.reactive.ServerHttpResponse;
 import org.springframework.http.server.reactive.ServerHttpResponseDecorator;
 import org.springframework.lang.Nullable;
-import org.springframework.web.context.ServletContextAware;
 import org.springframework.web.reactive.socket.HandshakeInfo;
 import org.springframework.web.reactive.socket.WebSocketHandler;
 import org.springframework.web.reactive.socket.adapter.ContextWebSocketHandler;
@@ -48,30 +45,7 @@ import org.springframework.web.server.ServerWebExchange;
  * @author Rossen Stoyanchev
  * @since 5.3.4
  */
-public class JettyRequestUpgradeStrategy implements RequestUpgradeStrategy, ServletContextAware {
-
-	@Nullable
-	private Consumer<Configurable> webSocketConfigurer;
-
-
-	/**
-	 * Add a callback to configure WebSocket server parameters on
-	 * {@link JettyWebSocketServerContainer}.
-	 * @since 6.1.0
-	 */
-	public void addWebSocketConfigurer(Consumer<Configurable> webSocketConfigurer) {
-		this.webSocketConfigurer = (this.webSocketConfigurer != null ?
-				this.webSocketConfigurer.andThen(webSocketConfigurer) : webSocketConfigurer);
-	}
-
-	@Override
-	public void setServletContext(ServletContext servletContext) {
-		JettyWebSocketServerContainer container = JettyWebSocketServerContainer.getContainer(servletContext);
-		if (container != null && this.webSocketConfigurer != null) {
-			this.webSocketConfigurer.accept(container);
-		}
-	}
-
+public class JettyRequestUpgradeStrategy implements RequestUpgradeStrategy {
 
 	@Override
 	public Mono<Void> upgrade(